Diffusion bonding of TiAl using reactive Ni/Al nanolayers and Ti and Ni foils

• Type: Article in International Scientific Journal
• Date: 2011

Authors

Sonia Simoes (Author) FEUP; Filomena Viana (Author) FEUP; Mustafa Kocak (Author) Other; Sofia Ramos, AS (Author) Other; Teresa Vieira, MT (Author) Other; Manuel F Vieira (Author) FEUP

Journal

Title: Materials Chemistry and Physics

Vol. 128 No. 1-2

Pages: 202-207

ISSN: 0254-0584

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 56 Citations

ISI Web of Science

Scopus - 64 Citations

Scientific classification

CORDIS: Technological sciences > Engineering > Materials engineering

FOS: Engineering and technology > Materials engineering

Other information

Authenticus ID: P-002-PPK

DOI: 10.1016/j.matchemphys.2011.02.059

Abstract (EN): The diffusion bonding of TiAl using reactive Ni/Al multilayer thin films with Ti and Ni foils was investigated. Bonding experiments were performed at 800 and 900 degrees C, at a pressure of 5 MPa and for bonding times of 30 and 60 min. The bonding surfaces were modified by sputtering, by deposition of Ni and Al nanolayers to increase the diffusivity at the interface, and Ti and Ni foils were used to fill the bond gap. The microstructure and chemical composition of the interfaces were investigated by scanning electron microscopy, electron backscattered diffraction and by energy dispersive X-ray spectroscopy. Sound joints were obtained with a combination of reactive multilayer thin films and Ti and Ni thin foils. Several AlNiTi intermetallic compounds were formed in the interface region. The mechanical properties of the joints were evaluated by nanoindentation and shear strength tests. Using foils in-between the nanocrystalline multilayers, which would be a useful method for correcting the absence of flatness of the parts to be joined, has drawbacks as it induces the formation of hard, brittle intermetallic compounds, responsible for the low shear strength of the joints.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6